Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 93 · 40 questions

Remember (Watts × hours ÷ 1000): Units (kWh) = watts × hours ÷ 1000. Bill = units × price per unit (e.g. 150 units × ₹6 = ₹900). Save: switch off, LED lamps, daylight, no standby, close the fridge quickly.

1. 1.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
2. 2.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
3. 3.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) switch off empty rooms (d) set the AC to 24 °C
5. 5.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) close the fridge quickly (d) leave the TV on standby
6. 6.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
7. 7.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
8. 8.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) unplug idle chargers (d) use daylight to read
9. 9.True or false: to use old filament bulbs saves electricity. (a) True (b) False
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
11. 11.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
13. 13.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) unplug idle chargers (d) run fans in empty rooms
14. 14.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) leave fridge door open (d) set the AC to 24 °C
15. 15.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
16. 16.True or false: to leave fridge door open saves electricity. (a) True (b) False
17. 17.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
18. 18.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
19. 19.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) set the AC to 24 °C (d) switch off empty rooms
20. 20.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
21. 21.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) use LED lamps
22. 22.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
25. 25.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
26. 26.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) leave fridge door open (d) switch off empty rooms
27. 27.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
28. 28.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
29. 29.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
30. 30.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
31. 31.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
32. 32.True or false: to use LED lamps wastes electricity. (a) True (b) False
33. 33.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
37. 37.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
38. 38.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity

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